《通过C#学Proto.Actor模型》之Spawning

Props是配置Actor和实例化Actor，那实例化后，就应该访问了，Props.Actor提供了Actor.Spawn(),Actor.SpawnPrefix(),Actor.SpawnNamed()三个方法，来获取Actor实例，需要注意的是，这些方法返回的并不是真正的Actor对象，而是一个ProgressID，一个代表Actor对象的进程ID，缩写PID。

 上代码：

using Proto;
using System;
using System.Threading;
using System.Threading.Tasks;

namespace P003_SpawningActors
{
    class Program
    {
        static void Main(string[] args)
        {
            var props = Actor.FromProducer(() => new MyActor());

            //产生一个自定义名称的PID
            var pid1 = Actor.Spawn(props);
            pid1.Tell(new MyEntity { ID = 1 });
            Thread.Sleep(1000);
            Console.WriteLine("------------------------------------------");
            //产生一个有gsw前缀，跟自动生成的名称的PID
            var pid2 = Actor.SpawnPrefix(props, "gsw");
            pid2.Tell(new MyEntity { ID = 2 });
            Thread.Sleep(1000);
            Console.WriteLine("------------------------------------------");
            //产生一个名称为gswpid的PID
            var pid3 = Actor.SpawnNamed(props, "gswpid");
            pid3.Tell(new MyEntity { ID = 3 });
            Console.ReadLine();
        }
    }

    public class MyActor : IActor
    {
        public Task ReceiveAsync(IContext context)
        {
            if (context.Message is MyEntity myEntity)
            {
                Console.WriteLine($"父 SelfID={context.Self.Id}   myEntity.ID={myEntity.ID}");           

                var cldProps = Actor.FromProducer(() => new MyChildActor());
                //第一个子Actor
                var pidCld1 = context.Spawn(cldProps);
                pidCld1.Tell(new MyChildEntity { Message = "1 message,myEntity.ID=" + myEntity.ID });
                //第二个子Actor
                var pidCld2 = context.SpawnPrefix(cldProps, "gswCld");
                pidCld2.Tell(new MyChildEntity { Message = "2 message,myEntity.ID=" + myEntity.ID });
                //第三个子Actor
                var pidCld3 = context.SpawnNamed(cldProps, "gswCldPid");
                pidCld3.Tell(new MyChildEntity { ID = 3, Message = "3 message,myEntity.ID=" + myEntity.ID });
            }
            return Actor.Done;
        }
    }
    public class MyChildActor : IActor
    {
        public Task ReceiveAsync(IContext context)
        {
            if (context.Message is MyChildEntity myChildEntity)
            {              
                Console.WriteLine($"子    SelfID={context.Self.Id}     Message={myChildEntity.Message}");          
            }
            return Actor.Done;
        }
    }
    public class MyEntity
    {
        public int ID { get; set; }
    }
    public class MyChildEntity
    {
        public string Message { get; set; }
        public int ID { get; set; }
    }
}

这个例子很简单，说明了三个Spawn的使用方式和Self.Id的特征，包括产生子Actor后，子Actor的Self.Id会带有父ID，结果如下：